I'm not familiar with the TC4 FT, but if the weight distribution is front heavy (like the FK05) and/or you run a stiff front end setup, then the front tires will be worked harder for traction and wear more. Its actually not a bad thing ($$$ withstanding) concerning performance if the car's front end is glued in the corners and not pushing on or off power.
With my current FK05 setup and running purple/orange fronts and double pink rears, my fronts are wearing .1mm more per run. But the front is stuck like George Jefferson under Nel Carter.
